Kai was Tir McDohl's bo stick instructor. As an instructor, he was ruthless, and Tir McDohl still calls him "master". When he was still living with the McDohl's he one day said, "I'll go out for a walk," and never came back. During the Gate Rune Wars, he joined the Toran Liberation Army and helped Tir in many battles. After the war he was chosen as one of the Six Great Generals, and became an army instructor for bo sticks. - Blue Moon